针对白龟山水库控制网要进行恢复改造这一具体任务,选用C级GPS网作为库区首级控制网进行施测。在约束平差中,通过选用不同三角点作起算点,检核控制网精度,发现有的三角点变化量已大大超过限差要求,进行删除,达到最终成果精度较高,检核点坐标吻合良好。在GPS拟合高程计算中,也作了地形改正等探讨。 Baicui Mountain Reservoir Control Network for recovery and reconstruction of this specific task, the selection of C-class GPS network as the reservoir area of ​​the first control network for testing. In the constraint adjustment, through the selection of different triangle as the starting point, check the control network accuracy and found that some changes in the triangular point has been greatly exceeded the requirements of the margin, to delete, to achieve higher precision of the final results, the check point coordinates coincide good. In the GPS fitting elevation calculation, also made a discussion of terrain correction.